Stoper with attaching device for rock drills



Dec. 10, 1940,

T. suzuKl STOPER WITH ATTACHING DEVICE FOR ROCK DRIL'LS 2 Sheets-Sheet l bFiled June 23, 1939 Deae 10, 1940. T. suzuKl STOPER WITH ATTACHING DEVICE FOR ROCI DRILLS Filed June 23, 1939 2 Stiens-sheet y2 .NHMJMIG Patented Dec. 10, 1940 UNITED STATES STOPER WITH ATTACHING DEVICE FOR ROCK DRILLS Tomiji Suzuki, Ibaraki-Ken, Japan, assignor to The Nippon Kogyo Kabushiki Kaisha, Shibaku, Tokyo, Japan, a limited company Application June 23, 1939, Serial No. 280,892 In Japan March 4, 1939 2 Claims.

My invention relates to improvements in a stoper having an attaching device for rock drills and, more particularly, rock drills of the hammer type, and its object is to provide a stoper having a rock drill attached thereto, and which facilitates easy handling and drilling by maintaining a suitable gap between the drill tip and the rock.

In rock drills heretofore provided, the tip of the drill or chisel is always pressed directly against the'rock when it is operated, whereby the tip sticks too tightly into the rock and wears very soon and, as the drill must be driven against the resistance of the sticking vof the tip, the boring eliciency is poor.

This invention is devised to obviate the above defects by providing special supporting legs rotatably mounted on the top end of a hollow cylindrical shell or casing, and a telescopictube fitted into the lower end of the shell and adapted to be operated by compressed air to press the ends against the upper and lower rock faces, and the pneumatically operated rock drill hammer is arranged in the hollow cylindrical shell to be operated by compressed air which is selectively supplied by an air control valve. Drill feed means are provided which are so arranged that 'the drill or chisel may be adjusted axially in relation to the hollow cylindrical shell without alecting the telescopic tube, thereby facilitating the drilling operation by maintaining a suitable gap between the chisel tip and the bottom of the drilled hole.

My invention will be better understood from the following description when considered in connection with the accompanying drawings, and its scope will be pointed out in the appended claims,

In the accompanying drawings- Fig. 1 is a sectional elevation of a stoper embodying my invention;

Fig. 2 is its plan view;

Fig. 3 is a sectional view showing the construction oi the air control valve; and

Figs. 4 and 5 are sectional Views taken on the lines A-A and B-B, respectively, of Fig. 3.

Referring to Figs. 1 and 2, I represents the hollow cylindrical shell or casing of the present device; 2 is a telescopic tube fitted in the shell I, having a pointed stanchion 3 fixed thereto. A three-legged supporting member 4 is rotatably secured to the other end of the shell I, and serves to rmly support the shell on ragged rock surfaces by cooperating with the pointed stanchion 3. 5 represents a pneumatic hammer type rock drill' tted in the shell I, 6 is an air control valve,

(Cl. Z-5l) is -a piston hammer, and 3 is a drill or chisel. 9 represents guide members formed on the rock drill 5 to hold it concentrically in the shell. IIJ is a screw rod secured at one end a to the rock drill 5 and having a passage therethrough communicating at one end with the air valve 6, while the other end b opens into the tightly closed chamber of the telescopic tube 2. For the purpose of closing this chamber a packing device is provided between the hollow screw rod I0 and the telescopic tube 2, which consists of leather packings c cl-amped by the seats d. A spring is provided which acts on the inside of the tube 2 to prevent it from slipping out of the shell when the telescopic tube 2 is forced to its innermost position in casing I, as shown in Fig. 1. is a nut engaging the exterior of the hollow screw threaded rod Il) andis supported by a bearing I2 secured to the shell A bevel gear wheel I3 is formed on the nut and meshes with the bevel wheel I4 which is turned by the handle I5. By turning the handle I5 clockwise or counterclockwise the nut is rotated through the bevel wheels I3 and I4 and the screw rod I0 is moved axially to the right or left in the shell I, thereby shifting the rock drill 5 axially as desired for adjustment.

Referring to Fig. 2, I6 represents side bars for holding the rock drill in assembly and having the spring on the free end clamped by a nut IS. I9 is a pipe leading to the valve 6 to supply the compressed air. 20 represents a handle for rotating the air valve 6, and 2| is a handle for further operating the valve. The hollow shell I is provided with openings 22 on both sides thereof to allow easy interchange of the drill steel.

The construction and operation of rthe air control valve 6 will be described by reference to Figs. 3 to 5, wherein 30 represents an inlet port for operating fluid leading to the rock drill 5 through the air passage 3|. 32 represents a passage leading to the inside of the hollow screw rod I0. 33 is an inlet port in the valve 6 communicating with the passage 32; 34 is an exhaust port in the valve 6 leading to the exhaust chamber 35; 36 represents a rod for operating the exhaust valve 39; and 3l is an exhaust passage, 38 is a passage connecting the air passage 32 with the exhaust chamber 35 and it is opened or closed by the valve 39 which is caused to open by depressing the handle 2| after which the inner end of the rod 36 is caused to act on one side of the exhaust valve 39 against the spring 4|) to tilt the valve 39. The exhaust port 38 is provided in the valve 6 for releasing a part of the compressed air -supplied to the hollow screw rod I0 in order to prevent too rapid extension of the telescopic tube 2, and to cushion the shock against the rock when the compressed air is supplied through the port 33 to force out the tube 2 to cause the device to operate.

'Ihe operation of the stoper ofv my invention as above described will now beexplained. When the device is to be fixed in position between the upper and lower rock walls by expanding the telescopic tube, the handle 20 is turned thereby turning the air control valve 6' to connect the inlet port 33 with the passage 32 leading to the inside of the hollow screw rod' lll, causing compressed air to be supplied to the telescopic tube 2 to force it out. Then the handle 20 is turned further to bring the air valve 6 into the position shown in Fig. 3, wherein the compressed air enters into the rock drill 5 through the inlet opening 30 to operate it while the telescopic tube 2 is extended against the rock to rmly support the shell. During the drilling operation the handle I5 can` be turned as desired, thereby turning the bevel wheel I3 through the bevel gear I4 to shift the rock drill 5 axially in the shell I, whereby the gap between the tip of the chisel 8 and the bottom surface of the drilled hole can be adjusted without interrupting the expanded condition of the telescopic tube 2.

'Ihe stoper of this invention has the advantage that the drilling operation can be continued by constantly maintaining a proper gap between the bit and the bottom of the drilled hole so that the chiselcan be turned smoothly with less wear of its working tip and improved drilling efficiency. It has the further advantage that the drill steel can be easily and quickly replaced through the window openings provided on both sides of the shell without disassembling other parts, and the center of drill and its driving parts can be maintained in alignment during the drilling operation.

While I have illustrated and described one ernbodiment which my invention may take, it will be apparent to those skilled in the art that further embodiments may be made, and improvements and changes made, all without departing in any way from the spirit or scope of the invention, for the limits of which reference must be had to the appended claims.

What I claim is:

1. A stoper having an attaching device for rock drills, comprising a hollow cylindrical shell having a three-legged support rotatably secured to the top end thereof, a telescopic tube tting in the lower part of said shell to hold the shell between opposite rock walls in cooperation with said three-legged support, a pneumatically operated rock drill mounted in said shell and adapted to act on a drill steel which is projected through the center of said three-legged support, an aircontrol valve device for selectively supplying the compressed air to said rock drill and to said telescopic tube, and means for axially moving said rock drill relatively to said shell and independently of said telescopic tube to facilitate adjustment thereof.

2. A device comprising a hollow cylindrical shell having window openings therein to allow the replacement of drill steel, a three-legged support rotatably secured to the top end of said shell, a telescopic tube fitted into theI other end of said shell and having a pointed end, a rock drill of pneumatic hammer type in said shell and adapted to operate a drill steel projecting through the center of said three-legged support, a hollow screw rod connected to said rock drill at one end and opening at the other end in the tightly closed chamber of said telescopic tube, a nut engaging the outside of said hollow screw rodV and being supported by a bearing xed to said shell, means for turning said nut from outside of the shell, and an air control valve for the rock drill adapted to` be operated from outside of the shell for selectively supplying compressed air to said rock drill and into the telescopic tube `through the hollow screw rod to force out said telescopic tube.

TOMIJI SUZUKI. 

